Machine for making slide fastener stringers



April 8,1947. 5;. DASHER c 2,418,761

HACHINETOR MAKING SLIDE FASTENER STRINGERS Filed Oct. 7. 1943 a Sheets-Sheec 1 April NJDASHER V 2,418,761

MACHINE FOR MAKING SLIDE FASTENER STRINGERS Filed 00;; '1, 1943 3 Sheets-Sheet s I ATTUMEY 'JVrmahDasfier atented 8 i947 moms FOR MAKING sLmE ms'ranaa 's'ramoaas Norman Dasher, New York, N. Y.1 Application October 7, 1943, Serial No. 505,406

3 Claims.

This invention relates to new and usefulimthe engagement of metallic scoops upon one edge of a continuous strip of tape moved by a drum mounted on the tubular shaft with a means arranged between said shafts in a manner to advance the outer shaft and tape in steps representing the distances between the scoops of said slide fastener stringers.

Still further, the invention proposes the provision of a guide block for supporting a section of tape leading to said drum at which point the scoops are adapted to be clamped upon said tape and provision of a means for advancing a metal strip to said guide block in a manner to permit the scoops to be cut from said strip adjacent said block and in a position to be clamped upon said tape.

Another object of the invention proposesthe provision of a punch at a point adjacent said block and operated by said inner shaft in a manner to out said scoops from the advancing. strip of metal.

Still another object of this invention proposes the provision of a clamp means operated by said inner shaft in a manner to clamp a scoop out I of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

- Fig. 1 is a side elevational view of a machine for making slide fastener stringers constructed in accordance with this invention.

.Fig. 2 is a plan view of Fig. 1.

Fig, 3 is a partial enlarged vertical sectional view taken on the line 33 of Fig. 2.

Fig. 4 is a partial enlarged vertical sectional view taken on theline 5-4 of Fig.2.

Fig. 5 is a perspective view of one of the scoops before being clamped upon the tape.

Fig. 6 is an enlarged partial vertical sectional.

view taken on the line 6-6 of Fig. 2'.

Fig. 7 is an enlarged partial vertical sectional taken on the line I0III of Fig. i.

from said advancing strip of metal upon said advancing tape for each of its stationary positions.

Still further, the invention proposes the provision of a gap spacer means arranged betweenmay be manufactured and sold at a reasonable cost.

For further comprehension of the invention, and of theobjects and advantages thereof, reference will be had to the following description and accompanying drawings, and to the appended claims in which the various-novel features The machine for making slide fastener stringers, according to this invention, includes a frame Iii consisting of a table top II supported upon a plurality of legs I2. A tubular shaft I3 and a concentric inner shaft I l are rotatively mounted upon the top II of the frame Ill. The inner shaft It has its ends extended beyond the ends of the tubular shaft l3 and these extended ends are rotatively supported in bearings i5 mounted upon the table top I I. The tubular shaft is capable of rotating independently of the inner shaft I l and is retained against axial movement relative to the inner shaft It by means of collars I6 mounted on the inner shaft It and which engage the ends of the tubular shaft I3.

Means is provided for continuously driving the inner shaft I4. This means comprises a pulley I! mounted on one end of the shaft M and over which a belt I8'extends. The belt extends downwards through openings I9 formed in the table top I I and engages over a second pulley 20. The pulley 20 is mounted on the extendeddriven shaft of an electric motor 2|. The electric motor 2I is mounted on the underside of the table top II.

Means is also provided for driving the tubular shaft I3 in steps representing the distances between the scoops of a slide fastener stringer. This means is driven by the inner shaft I4 and comprises a lever 22 pivoted at one end upon a bracket 23 mounted on the table top II. The

other end of the lever 22 is provided with a roller 24 which bears against a cam 25 mounted on one'o'fth e extended ends of the inner shaft I I4. Intermediate of its ends the lever 22 is formed with an upwardly extending arm 26 provided at a 4 a 3 extending brackets mounted on the table top I I I on opposite sides of the drum 31. The tubular its top end with a pivotally mounted pawl 21. A

7 leaf spring 2i! mounted-on the arm 23 urges the pawl 21 towards a ratchetwheel29 mounted onv one e'nd'of the .tubular shaft IS: A leaf spring 39, Fig. '1', mounted on the bracket 23'bears against the lever 22' and maintains it in raised position in which the roller 24 will continually engage the a slide fastener. After the projecting portion of ,shaft i3 passes through. intermediate b aring portions formed in the brackets 55. Exp nsion springs 56 operate between the base walls of the slots 54 and the bottom faces of the blocks the cam 25 passes, the spririg 39 will urge the lever 22 upwards again and cause the pawl to idle back'over the teeth of the ratchet wheel 29.

A brake means 3| is provided upon the tubular I shaft I3 for holding the tubular shaft against being turned back when the pawl 21 idles over the teeth of the ratchet wheel 29. This means is characterized by a brake drum 32, Fig. 7, mounted on the tubular shaft l3 and over which a brake band 33' extends. One end of the band 33 is securely attached by several pins 34 to the table top [I on one-side of thebrake drum 32. The other end of the band 33 is rotatively-attached to one'end of a screw 35 which rotativelyengages a bracket 36 mounted on the table top H on th other side of the brake drum 32.

The screw 35 is to be adjusted so that the brake band 33 lightly grips the brake drum 32 and exerts sufilcien't pressnre to prevent'the tubular shaft 13 from beingr'otated backwards on the return stroke of the pawl 21 relative to the ratchet wheel 29- 1 A drum 31 is mounted upon the tubular shaft l3 for supporting the tape 38 from which the slide fastener stringers are being made. The tape 53 for urging the blocks into araised position inwhich the counterpressure roller 5! will be outfof contact with the drum 31; Screws 51 are threadedly engaged through the top portions of the brackets 55 and urge the-blocks downwards against the action of the springs58 to engage the counterpressure rolier 51 against the drum 31.-

Guide blocks 58, See Fig. 6, are mounted upon the top face of the table top II for engaging an area of 'the tape 38 before it passes over the drum 31 for directing this area of the tape with an edge portion thereof towards a metal strip 59 which is being advanced towards this edge portion and from which the metal scoops 59 are cut and engaged upon this edge portion.

The metal strip 59 comes from a spool 80, Figs. 1 and 2, rotatively mounted on a stud shaft 6! carried by a bracket 62 mounted on the back edge of the table top. The metal strip 59 is formed with a plurality of equally spaced upwardly extending projections 63 and after coming off the spool 69 the metal strip 59 passes beneath a guide roller 64 rotativel'y supported in a pair of spaced brackets 55 mounted on the tabletop ii.

Means is provided for advancing the metal strip 59 towards the guide block 59. This means comprises a shoe 6'6, see Fig. 3, pivotally supported upon one end of a link 81. The bottom face of the shoe 66 is formed with inwardly extending recesses 63 which engage over the upwwardly extending projections 63 of the metal 38 comes from a spool 39 located beneath the table I is attached to the bottom face of the table topv II and the other end is rotatively engaged upon a screw which threadedly engages a boss 46 fixedly mounted on the bottom face of the table top H. I

From the spool 39 the tape 38 passes through a pair of adjacent rollers 41--mounted on the bottom face of the table top 1 I. These rollers I .41, Fig. 6, are rotatively supported in brackets 48 mounted on the bottom face of the table top H on either side of an opening 49. The tape 33 then passes upwards through the opening 49 and has the scoops 50 attached thereto adjacent the top face of the table top H and before the tape 33 passes over the drum 31.

A counterpressure roller 5| is positioned above the drum 31 and urges, the tape 38 against the drum 31 to feed the tape 38 in steps representing the distances between the scoops 59 as the drum is moved in these steps by the means previously described. This counterpressure roller 5| is rotatively-supported .cn a shaft 52 which has its ends supported in blocks 53. The blocks 53 are 'slidably supported in slots 54 formed in upwardly strip 59. The free end of the link 61 is in turn pivotal'y supported upon the bottom end of a lever 69, Figs. 1 and 2, which is pivotally supported intermediate of its ends upon an upwardly extending bracket 10 projecting from the table top H. A leaf spring H is mounted on the bottom end of the lever 59 and bears against the top face of the shoe 66 to urge it into facial contact withthe metal strip 59. The free end of the lever 69 carries a roller 12 which enga es against a cam 13 mounted on the inner shaft I4. The cam 13 is capable of moving the lever 69 a sufllcient distance to move the metal strip a distance equal to one space between adjacent upwardly extending projections 63 of themetal strip 59.

Spaced tracks 14 are formed on the table top H and extendalong the sides of the shoe 66 limiting it to movement in, a direction parallel to the length of the metal strip 59. Means is proafter having been advanced. This means comprises a leaf spring 15, Fig. 3, which has one of its endsv securely attached to the bottom face of the table top H by means of pins 16. The free end of this leaf spring 15 is extended upwards. through an opening 11 formed in thetable top H and extends into one of the projections formed in the metal strip 59. The leaf spring 15 is extended in the direction the metal strip moves and when the metal strip 59 is moved forwards by the shoe 6 6 the spring 15 will merely flex downwards. However, on the back stroke of the 'shoe 66, the spring 15 will maintain its engaged ing theshoe 68 to idle over the projections 83 against the action of the spring II.

The lever 89 is drawn into a position in which its rolle'r I2 maintains contact with the cam I3 by means of a spring I8. The spring I8 has one end connected to the lever 89 and its other end connected with a projection I9 from the table top II.

A punch mechanism is provided for punching the scoops 58 from the metal strip 59 in the vicinity of the guide block 58. This punch mechanism comprises a top movable punch die 88, Figs. 1 and 4, pivotally mounted intermediate of its ends upon a bracket 8|. The bottom of the die 88 is normally superimposed above the advancing metal strip 59 and has a complementarydie recess 82 cut in the table top. A filler .element 93 is vertically slidably mounted in the recess 82 and is normally urged into a raised position by the expansion springs 84, see Fig. 4. The springs 89 operate between the bottom of the filler, element 83 and a bracket 85 extended across the bottom of the recess and mounted on the bottom face of the table top II. The springs 88 merely exert enough pressure to urge the filler element 83 into a position flush with the top of the table top, so that the cut scoops 58 will be advanced towards the tape 38 by the advancing metal strip 59 to be clamped thereon.

The free end of the movable punch die 88 is provided with a roller 88 which bears against a cam 81 mounted on the inner shaft I4. .A spring 88 operates between the end of the movable punch die 88 and a portion'of the bracket 8| for urging the die 88 into a position in which its roller 86 will continually engage its respective cam 87. I

Clamp means is provided for clamping a scoop 58 in position upon the tape for each stationary position of the tape 38. This clamp means is characterized by clamp members 89, Figs 2 and 6, which extend laterally outward from the guide blocks 58 and which are slidably mounted on the top face of the table top. Pins 98 extend from the table top II through slots 9! formed in the clamp members 89 and comprise the means for slidably mounting the clamp members 89.

Each of the clamp members 89 has superimposed clamp jaws 92 and 93. The aligned clamp jaws 92 are designed to initially lightly clamp the scoops 58 upon the edge portion of the tape 38 and the aligned clamp jaws 93 are designed to complete the clamping action and cause the scoops to be fixedly clamped upon the edge of the tape 38.

Springs 98 operate between pins 95 mounted on the side of the clamp members 89 and pins 96 mounted on the top face of the table top II for urging the clamp members 89 into an inoperative position. Means controlled by the inner shaft I8 urges the clamp members 89 into an operative position against the action of the springs 94. This means comprises levers 9i pivotally mounted intermediate of their ends upon posts 98 extending upwards from the table top II. One of each of the levers 91 bears against one end of one of the clamp members 89 and its other end bearing against a cam 99 mounted on its adjacent end of the inner shaft I4. These cams 99 act to urge-the levers to in turn urge the clamp members 89 into their operative positions.

A gap spacer means I88, operated by the inner shaft I8 is provided for advancing the tape 38 a selected amount at selected periods for forming a blank'space on the tape 38 between adjacent a belt I I7 extends.

the inner shaft I 88. The opposite end of the shaft I83 carries a sprocket wheel I88 aligned with a complementary sprocket wheel I81 on the tubular shaft I3. A sprocket chain I88 engages over the sprocket wheels I86 and I81 for transmitting rotations of the shaft I83 to the tubular shaft I3. I

Mounted intermediate of the ends of the shaft I83 there is a speed reduction and electro-magnetic clutch unit I88 which is normally open preventing rotations of the shaft I83 from being transmitted to the tubular shaft I3. A novel means is provided for closing the unit-I89 to cause rotations of the shaft I83 to be transmitted to the tubular shaft I3 to quickly advance the tape 38 to form the desired blank spots. This means comprises a gear II8 mounted on the inner shaft I4 and which meshes with a gear of a speed reduction train of gears III which terminates in a bevel gear II2, Fig. 2. The bevel gear H2 in turn meshes with a bevel gear II3 mounted on a stud shaft H4 rotatively supportedin a bracket H5. The free end of the stud shaft I I8 carries a pulley H8 over which The other side of the 'belt I" extends over a second pulley H8 mounted on a tud shaft II9 rotatively supported in a bearing I28.

The belt II'I carries a plurality of spaced metallic contact I2I releasably held in position by means of screws I22, Fig. 9. These contacts I2I are designed to bridge a pair of electrical contacts I23 mounted on the side of the speed reduction and electromagnetic clutch unit I89, Fig. 8, to close theclutch of this unit and cause transmission of rotations of the shaft I83 to the tubular shaft 23 to take place. Since the speed reduction chain of gears II I will cause the belt II! to be moved very slowly and the inner shaft I8 causes one scoop to be clamped upon the tape 38 for each complete revolution, a number of scoops will be clamped on the tape between each time a contact I2I of the belt I II closes the contacts I23 to cause'the tape to be rapidly advanced to form the blank spot on the tape. The space between the contacts I2I will control the number of scoops that will be engaged upon the edge portion of the tape 38 between each blank space. The use of the screws I22 for holding the contacts I2I upon the belt I" permits these contacts I2I to be removed from the belt or be added to the belt as desired.

An interrupter unit is associated with the punchdie 98 for holding same in a depressed condition during those periods that the tape 38 moves for producing the scoopless areas. More specifically, this means includes a bolt-like .rod-

ated thereby.

moving the bolt-like rod lll'into latching position. The latching position of this rod is one in which it indirectly holds the punch die 80 in said depressed condition.

The bolt-like rod I2! is provided with n. depressible head I which is slidably mounted so that it may be depressed. A small spring l3! holds the head I30 in a normally extended position. When one of the said cams I29 shifts the bolt-like rod I25 laterally, the head I30 which normally engages against the side of the punch die 80 becomes depressedin relation to said boltlike rod I25. The next time that the cam 81 lifts the tail end of the punch die 80 upwards, the head I30 rides beneath the tail end of the punch die 80 and so holds the front end in its depressed condition. Even though the cam 81 then moves into an inoperative position, .the punch die 80 remains locked until such time that the cam I29 rides free of the bolt-like rod I25. When the punch die 80 is in its depressed condition the shoe 66 merely idles back and forth upon the projections 63 of the metal strip 59 without advancing the same.

The operation of the device is as follows:

The inner shaft M will be continually driven by the motor 2| and'for each complete revolution of the inner shaft ll one scoop 50 will be clamped upon the edge portion of the tape 38 and the tape ,will be advanced a distance equal to the distance between adjacent scoops 50. The arrangement of the cams is such that the steps required to punch the scoops 50 and clamp them v in position-on the tape will take place in suc- Thje contacts l2! are engaged uponthe belt III in desired spaced positions for percession.

mitting a desired number of scoops to be engaged upon the tape 38 before it is rapidly advanced to form the blank spaces at which the tape is to be out forming the stringers of a desired length.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modifications coma ing within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

l. A machine for making slide fasteners havcent said drum to have scoops stamped therefrom and clamped in position on the tape of said slide fastener, comprising a shoe engaging said strip andformed with spaced recesses engaging said projections, a pivotally mounted lever, a cam on said-inner shaft engaging one end of said lever to pivot said lever to move said shoe to advance said. strip, a spring for returning said lever to its starting position, and means pivotally connecting said shoe to the other end of 8 I v 2. A machine for makin slide fasteners having a tubular shaft and a concentric continuously driven inner shaft with a drum mounted on said tubular shaft and over which the completed slide fastener stringer is adapted to pass and means driven by said inner shaft for driving said tubular shaft in steps representing the distance between the scoops of slide fastener strings, means for advancing a metal strip having spaced upwardly extending projections to a position adjacent said drum to have scoops stamped therefrom and clamped in position on the tape of said slide fastener, comprising a shoe engaging said strip and formed with spaced recesses engaging said proiections, a pivotally mounted lever, a cam on said inner shaft engaging one end of said lever to pivot said lever to move said shoe to advance said strip, a spring for returning said lever to its starting position, and means pivotally connecting said shoe to the other end of said lever to be operated thereby, and means for holding said strip against moving backwards when the shoe idles hack to its starting position over said projections when said lever is moved back by said spring.

3. A machine for making slide fasteners having a tubular shaft and a concentric continuously driven inner shaft with a drum mounted on said tubular shaft and over which the completed slide fastener stringer is adapted to pass and means Nu ber said lever to beoperdriven by said inner shaft for driving said tubular shaft in steps representing the distance between the scoops of slide fastener stringers, means for advancing a metal strip having spaced upwardly extending projections to a position adjacent said drum to have scoops stamped therefrom and clamped in position on the tape of said slide fastener, comprising a shoe engaging said strip and formed with spaced recesses engaging said proj ections, a pivotally mounted lever, a. cam on said inner shaft engaging one end of said lever to pivot said lever to move said shoe to advance said strip, a spring for returning said lever to its starting position, and means pivotally connecting said,

shoe to-the other end of said lever to be operated thereby, and means for hOldlIlg said strip against moving backwards when the shoe idles back to its starting position over said projections when said lever is moved back by said spring, said latter means comprising a leaf spring positioned adjacent the bottom face of said metal strip, said upwardly extending projections forming recesses on the bottom face of said strip, and said leaf spring having its free end directed in the direction in which said tape moves and engaging in said recesses.

NORMAN DASI-IER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date 2,310,660 Ulrich Feb. 9, 1943 2,290,263 Wintritz July 21, 1942 2,261,552 Koppel Nov. 4, 1941 2,148,673 Arentzen Feb. 28, 1939 2,245,031 Gottlieb June 10, 1941 2,275,769 Kiessling Mar. 10, 1942 1,982,458

Seltzer Nov. 27, 1934 

